Yes, Facebook apps helps much in the past to get thousands of likes in no time. But not much now after timeline update but many people also using this method currently. You can try your luck by placing user interactive app on your page and spread that app by using different techniques.

You can always to a fangated application or an app where users have to click the like button in order to view the content in the application. Make sure it is something of value and not so broad that people who don't really like your page or brand but just want the content will click on.

North Social makes some pretty good apps, and they are relatively cheap,

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